Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. Hy4 PreviewvsNex-N2.5-Mini (free)
Updated Sep 2026

Hy4 PreviewvsNex-N2.5-Mini (free)

Nex-N2.5-Mini (free) is cheaper than Hy4 Preview at $0/M vs $0.834/M input tokens.

Hy4 Preview and Nex-N2.5-Mini (free) compared across 15 shared prompts
SpecHy4 PreviewNex-N2.5-Mini (free)
Input price$0.834/M tokensFree
Output price$2.501/M tokensFree
Context window1.0M tokens262K tokens
Free API (OpenRouter)NoYes (1 provider)
ReleasedAug 2026Sep 2026
Side by side

Same prompt, both answers

Opening lines from 6 of the 15 prompts both answered. Formatting stripped, words untouched.

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

Hy4 Preview1,253 words
This is a counterfactual scenario of massive proportions. The transistor is the fundamental building block of the modern world; moving its invention from Bell Labs in 1947 to 1920 (perhaps an accidental discovery during early radio research) grants humanity an extra 27 years of development during a period defined by…
Read the full answer
Nex-N2.5-Mini (free)2,076 words
A 1920 transistor would not by itself prevent fascism, the Great Depression, or imperial expansion, so World War II might still happen. But it would make electronics 10–20 years more advanced than in our timeline, with huge effects on radar, codebreaking, computing, missiles, space, consumer goods, and Cold War power…
Read the full answer

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

Hy4 Preview378 words
This is a comprehensive, aggressive 3-month biohacking protocol designed for an individual with intermediate to advanced experience. It focuses on metabolic flexibility, autophagy, mitochondrial biogenesis, and neurological plasticity.
Read the full answer
Nex-N2.5-Mini (free)3,213 words
Below is a 12-week longevity/performance protocol for a generally healthy adult. It is not medical advice. Before starting—especially if you have diabetes, hypertension, arrhythmia, kidney/liver disease, a history of eating disorders, are pregnant, or take medications—get clinician clearance and use labs to personalize…
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

Hy4 Preview1,028 words
This architecture contains several critical flaws that will lead to data loss, poor user experience, and security vulnerabilities. While it attempts to solve scaling via horizontal scaling, the synchronization strategy (Last-Write-Wins) and the transport mechanism (HTTP polling between servers) are fundamentally…
Read the full answer
Nex-N2.5-Mini (free)1,869 words
The biggest red flags are: client-clock LWW for document content, polling PostgreSQL for real-time fanout, CDN caching mutable authenticated APIs, per-server WebSocket state with no durable replay, and full HTML snapshots as the main save mechanism.
Read the full answer

Adversarial Contract Review

Here is a contract for a software consulting engagement: --- SOFTWARE CONSULTING AGREEMENT This Agreement is entered into between TechCorp…

Hy4 Preview1,433 words
This contract is extremely one-sided and heavily favors the Client (TechCorp Solutions Inc.). Several of these clauses are not just unfair; in many jurisdictions, they may be considered "unconscionable" (so unfair that they shock the conscience) or illegal, particularly regarding non-competes and liability.
Read the full answer
Nex-N2.5-Mini (free)1,439 words
Below is a contractor-protective review, not legal advice. Enforceability varies by jurisdiction, especially for non-competes, arbitration, IP assignments, and limitation-of-liability clauses. A local attorney should review before signing.
Read the full answer

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

Hy4 Preview303 words
Here is a recipe for a savory, comforting dish that requires minimal effort but tastes like it came from a restaurant. Dish Name: Golden Garlic Butter Noodles Estimated Time: Prep: 2 minutes Cook: 10 minutes Total: 12 minutes The 7 Ingredients: Spaghetti (or any long pasta) Butter Garlic (fresh cloves or jarred minced…
Read the full answer
Nex-N2.5-Mini (free)111 words
Golden Peanut Lantern Noodles Time: Prep 5 min Cook 10 min Serves: 2 Ingredients — 7 pantry staples Spaghetti or any noodles Peanut butter Soy sauce Honey Garlic powder Rice vinegar Water Instructions Cook the noodles: Boil noodles in water until tender. Reserve about ½ cup cooking water, then drain.
Read the full answer

Explain Like I'm a Specific Expert

Explain how a large language model (like GPT or Claude) learns and generates text to each of these three audiences: 1. **An experienced…

Hy4 Preview959 words
Here are three explanations of how a large language model learns and generates text, each tailored to a specific audience. The Experienced Software Engineer Focus: Architecture, lossy compression, and the "emergent" nature of scale.
Read the full answer
Nex-N2.5-Mini (free)889 words
Experienced software engineer, skeptical of “next word prediction” Think of training an LLM less like teaching it rules and more like running a huge offline simulation. You feed it a corpus of text, tokenize it into chunks, and give it a simple task: given the previous tokens, predict the next token.
Read the full answer
Our Verdict
Hy4 Preview
Hy4 Preview
Nex-N2.5-Mini (free)
Nex-N2.5-Mini (free)Runner-up

Not enough votes to call it. On the specs, Hy4 Preview has the edge: bigger model tier, bigger context window.

Too close to call
API pricing

Cost per 1M tokens

Hy4 Preview
Input
$0.83
Output
$2.50
Nex-N2.5-Mini (free)
Input
$0.000
Output
$0.000
Where to run it

3 hosts

Hy4 Preview2 hosts
HostInOutContextUptime
SSiliconFlowfp8$0.83 in·$2.50 out·1M·100% upTencentfp8$0.83 in·$2.50 out·1M·100% up
Nex-N2.5-Mini (free)1 host
HostInOutContextUptime
NNex AGIbf16degraded$0 in·$0 out·262k·92.2% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Hy4 Preview is developed by Tencent while Nex-N2.5-Mini (free) is developed by Nex AGI. Hy4 Preview has a 1.0M token context window vs Nex-N2.5-Mini (free)'s 262K. You can compare their actual outputs across 15 challenges on Rival to see how they differ in practice.

It depends on your use case. Hy4 Preview and Nex-N2.5-Mini (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 15 challenges so you can judge which fits your needs best.

Hy4 Preview costs $0.834/M input tokens and Nex-N2.5-Mini (free) costs $0/M input tokens. Nex-N2.5-Mini (free) is $0.83/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Hy4 Preview and Nex-N2.5-Mini (free) across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Keep exploring

More comparisons

Against the newest arrivals

Hy4 Preview logoDeepSeek V4 Flash Vision Exp logo
Hy4 Preview vs DeepSeek V4 Flash Vision ExpLanded Sep 2026
Nex-N2.5-Mini (free) logoSolar Pro 4 logo
Nex-N2.5-Mini (free) vs Solar Pro 4Landed Sep 2026
Hy4 Preview logoHy3 logo
Hy4 Preview vs Hy3Landed Sep 2026
Nex-N2.5-Mini (free) logoQwen3.7 Flash logo
Nex-N2.5-Mini (free) vs Qwen3.7 FlashLanded Sep 2026
Hy4 Preview logoLing 3.0 Flash logo
Hy4 Preview vs Ling 3.0 FlashLanded Sep 2026
Nex-N2.5-Mini (free) logoMuse Glimmer 30B logo
Nex-N2.5-Mini (free) vs Muse Glimmer 30BLanded Sep 2026
Hy4 Preview logoGLM 5.3 logo
Hy4 Preview vs GLM 5.3Landed Sep 2026
Nex-N2.5-Mini (free) logoTernary Bonsai 2 27B logo
Nex-N2.5-Mini (free) vs Ternary Bonsai 2 27BLanded Sep 2026

Same lab, same size, long tail

Hy4 Preview logoClaude Opus 4.6 logo
Hy4 Preview vs Claude Opus 4.6Same size
Hy4 Preview logoGPT-6 Astra Pro logo
Hy4 Preview vs GPT-6 Astra ProSame size
Nex-N2.5-Mini (free) logoNex-N2.5-Pro (free) logo
Nex-N2.5-Mini (free) vs Nex-N2.5-Pro (free)Same lab
Nex-N2.5-Mini (free) logoOx Alpha logo
Nex-N2.5-Mini (free) vs Ox AlphaSame size
Hy4 Preview logoGrok 3 logo
Hy4 Preview vs Grok 3Same size
Nex-N2.5-Mini (free) logoGrok 3 Beta logo
Nex-N2.5-Mini (free) vs Grok 3 BetaNew provider
Nex-N2.5-Mini (free) logoGrok 3 Mini Beta logo
Nex-N2.5-Mini (free) vs Grok 3 Mini BetaNew provider
Hy4 Preview logoGrok 3 Thinking logo
Hy4 Preview vs Grok 3 ThinkingSame size

Model pages

Hy4 Preview logo
Hy4 Preview58 outputs, specs and price
Nex-N2.5-Mini (free) logo
Nex-N2.5-Mini (free)15 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Default Index
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed